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Age questions - quick way to do it?
Posted: Mon Mar 10, 2014 10:35 am
by SleepyHead
Am struggling to explain this to DD in an 'easy' way. Any advice please would be much appreciated.
Question 1
Eleanor is 11 years and 4 months old. Her sister Mary is 3 years and 10 months younger than Eleanor.
How old is Mary? Give your answer in years and months
Question 2
Katharine was born on 1st May 1997
Helen was born on 1st March 2003
(a) By how many years and months is Katharine older than Helen?
(b) Sam is exactly 18 months younger than Katharine. Work out sam's date of birth
thanks
Sleepyhead
Re: Age questions - quick way to do it?
Posted: Mon Mar 10, 2014 11:49 am
by hermanmunster
SleepyHead wrote:Am struggling to explain this to DD in an 'easy' way. Any advice please would be much appreciated.
Question 1
Eleanor is 11 years and 4 months old. Her sister Mary is 3 years and 10 months younger than Eleanor.
How old is Mary? Give your answer in years and months
I would do this one by converting the whole lot to months but then I grew up chanting the 12 times table (do they still learn this??)
So 11 yrs 4 mos = 136
minus 3 yrs 10 months or 46months
= 90 months or 7 years 6 months.
Re: Age questions - quick way to do it?
Posted: Mon Mar 10, 2014 12:19 pm
by Okanagan
SleepyHead wrote:Question 1
Eleanor is 11 years and 4 months old. Her sister Mary is 3 years and 10 months younger than Eleanor.
How old is Mary? Give your answer in years and months
I would do this as subtract 4 years, and than add two months. i.e. 7 years and 6 months
SleepyHead wrote:Question 2
Katharine was born on 1st May 1997
Helen was born on 1st March 2003
(a) By how many years and months is Katharine older than Helen?
(b) Sam is exactly 18 months younger than Katharine. Work out sam's date of birth
a) If both dates were May the difference would be 6 years (2003-1997). But there are two months difference between March and May, so subtract those to give 5 years and 10 months.
b) Subtract 2 years, then add six months.
It is worth learning the month -> number correlations so that she can see quickly that October is 10, August is 5, May is 5 etc. Then sums like May - minus two months = March becomes the simpler sounding 5-2=3 (and you'd know 3 is March).
Re: Age questions - quick way to do it?
Posted: Tue Mar 11, 2014 10:44 am
by SleepyHead
hermanmunster wrote:converting the whole lot to months
thanks - this a great idea.
Okanagan wrote:It is worth learning the month -> number correlations so that she can see quickly that October is 10, August is 5, May is 5 etc. Then sums like May - minus two months = March becomes the simpler sounding 5-2=3 (and you'd know 3 is March).
like this method too
Does anyone know where I can find more of these examples for practice?
Re: Age questions - quick way to do it?
Posted: Tue Mar 11, 2014 6:40 pm
by parent2013
Okanagan wrote:a) If both dates were May the difference would be 6 years (2003-2007).
I think there's a typo 6 years (2003-1997).
The other variation which I found slightly complicated is:
If 15th Jan is Wednesday, what day is 1st April?
Solution 1: April fools day
Solution 2: Look in calendar for 2014
Ok... I'll be serious now. Calculate using times 7 technique ... it is Tuesday.
Re: Age questions - quick way to do it?
Posted: Tue Mar 11, 2014 8:26 pm
by Bobmumof3
We used hermonmunsters method here too.
I hated those what day questions too! My ds was better than me at then that's for sure
Re: Age questions - quick way to do it?
Posted: Wed Mar 12, 2014 12:25 am
by parent2013
My ds and I hated these question as well, especially when the gap goes beyond 2 months.
Re: Age questions - quick way to do it?
Posted: Wed Mar 12, 2014 6:42 am
by SleepyHead
I remember reading a more detailed post about calendar questsion, it explains it in more detail. Just can't stand these questions either and DD looks completely lost when I try to explain it to her.
Here's the link
http://www.elevenplusexams.co.uk/forum/ ... =2&t=35432" onclick="window.open(this.href);return false;
Re: Age questions - quick way to do it?
Posted: Wed Mar 12, 2014 11:32 am
by SleepyHead
Just wondering how people teach their DC to add age.
So if you need add Mary's age of 10 years 9 months to Sean's age of 2 years 4 months, and would you do
10years 9months +
2 years 4 months
-------------------------
12 years 13months
= 13 years 1 month
--------------------------
?
thanks sleepyhead
Re: Age questions - quick way to do it?
Posted: Wed Mar 12, 2014 12:32 pm
by parent2013
Convert to months, add/subtract them. Then divide by 12. The whole number is years, and remainder is months.